Air-Powered Systems: VAK-Matic and ALL-in-ONE automatic units. Over the
years we have seen two problems occur that are easily preventable and fixed.
Problem: "The air continues to run, even if I pull the electric plug from the
wall." This is due dirt getting inside the solenoid and preventing the plunger from
completely closing. It only takes a small spec to keep it open.
Solution #1: Clean out the solenoid (a brass colored metal cylinder 1" dia. X
2" long) by removing the 9/16 nut and slide the coil and washer off. Just below the
threads there is a 1/8" section of the post that can be gripped with pliers to unscrew
the post. Caution: do not grip below this section as the post is hollow and will
be crushed. Inside is a plunger and spring, do not misplace. Remove the dirt on the
plunger or the hole. Replace by reversing the above steps.
Solution #2: Invest in a filter for the air line (Coalescing type is best) to
prevent this from happening again. We have found that shops with expensive filtering
systems at the compressor or regulator on the wall, still have this problem. This is
due to the fact that when you are ready to use the unit, someone picks an air-line off
the floor and plugs it in. Chips, sawdust, etc. are in the quick disconnect and get
blown right into the unit. Our filters are design to attach directly to the unit and
prevent this problem. A coalescing filter will also remove water and oil from the line.
Problem: "The unit doesn't get up to vacuum and shut off like it use to. It's
getting over 85psi while it's running, so I know it has plenty of air." (The air-powered
units need a minimum of 85-90 psi when the unit is on.)
Solution: Clean out the VAK Pumps if cleaning out the solenoids didn't solve the
problem. Some small debris has blown through the solenoid and lodged inside the VAK Pump
venturi section. This is a very small opening that controls the flow of air and if
partially blocked, reduces the compressed air volume needed for maximum
performance. Remove the VAK Pump by first removing the vacuum line (clear hose) that has
a check valve (black item) imbedded inside it. Swing the VAK pump up and unscrew
it. Unscrew the insert (5/8" hex) and blow it out from the pointed end. Clean out the
body by blowing it out.
Opening the box and cleaning out the solenoid or VAK pump will not void